update docs

Author: fredemmott

docs/_docs/classes/codegen-class-base.md

@@ -31,13 +31,7 @@ Generics
 
 This API is likely to be changed in a future release of Hack Codegen.
 
-A class can be marked as generic by calling `setGenericsDecl()`, which takes a `Map`.
-
-The keys for this map are the type name, and the values are an optional `as`
-constraint - use `null` for no contraint.
-
-For constraints other than `as`, also leave the value as null, but put the name
-and the constraints together in the key, eg `Map { 'T as Foo super Bar' => null }`;
+A class can be marked as generic by calling `addGenerics()`, which takes a `Traversable`. Alternatively, you can separately call `addGeneric()` or `addGenericf()` for each generic.
 
 Constants
 ---------

docs/_docs/classes/codegen-function.md

@@ -32,7 +32,7 @@ Attributes
 
 To make a function memoized (adding the `<<__Memoize>>` attribute), call
 `->setIsMemoized(bool $value = true)`; for other attributes, call
-`->setUserAttribute(string $name, ?string $value)`.
+`->addUserAttribute(string $name, ?string $value)`.
 
 FIXMEs
 ------

docs/_docs/hack-builder/blocks.md

@@ -44,10 +44,10 @@ Switch Statements
 <?hh
 $builder
   ->startSwitch('$var')
-  ->addCase('foo')
+  ->addCase('foo', HackBuilderValues::export())
   /* do stuff */
   ->breakCase()
-  ->addCase('bar')
+  ->addCase('bar', HackBuilderValues::export())
   /* do stuff */
   ->returnCase('$x', HackBuilderValues::literal())
   ->addDefault()

docs/_docs/overview/partially-generated.md

@@ -81,7 +81,7 @@ $file = $factory
   ->setPseudomainHeader(
     $factory
       ->codegenHackBuilder()
-      ->beginManualSection('mykey')
+      ->startManualSection('mykey')
       ->addLine('require_once(\'vendor/autoload.php\');')
       ->endManualSection()
       ->getCode()

docs/_docs/overview/quick-start.md

@@ -59,7 +59,7 @@ function make_script(): void {
         ->setReturnType('void')
         ->setBody(
           $cg->codegenHackBuilder()
-            ->beginManualSection('greeting')
+            ->startManualSection('greeting')
             ->addAssignment(
               '$greeting',
               "Hello, world!",